Chronic Fatigue question

I was wondering if someone with CFS can have breaks in the exhaustion?
I was just told by my rummy who was testing me for different things that in order to have a CFS diagnosis you have to be exhausted all the time for a matter of months and not letting up. But then i read on the CDC website to be diagoned that some people have a pattern of remission and relaps of exhaustion and other symptoms. I have been trying to find out whats wrong with me for over 7 years now and no one has the answer.